Sig Sauer outfitted its 4-12x40 WHISKEY3 Riflescope with quality anti-reflection coated optics and a TriPlex Illuminated reticle. The optical elements are crafted from Low-Dispersion (LD) glass to provide true color and to maximize resolution of images. Coated with the SpectraCoat full multi-coatings, the lenses offer high transmission throughout the entire visible spectrum, delivering bright and crisp images. To ensure that the image quality is not degraded by external environmental conditions and elements, the optics are protected by the LensArmor coatings against abrasions and scratching. Another highlight of this riflescope is its illuminated HellFire TriPlex reticle, which is located in the 2nd focal plane and offers a brilliant red center illumination. It features three medium posts, a fine crosshair, and uses a fiber-optic technology to finely control illumination of the bright red center dot.

To endure the toughest conditions, the 1" maintube is made from a durable and lightweight aluminum alloy, and provides a waterproof and fogproof performance. The windage and elevation knobs are knurled for slip-free operation and offer 1/4 MOA adjustment ranges with 70 MOA increments. Also available with this riflescope is the Sig Ballistic Turret Dial (SBT), which features a precision tactical finger-operated knob. The Sig Ballistic Turret (SBT) is a custom laser-etched elevation dial that uses your bullet specifications, ballistic coefficient, muzzle velocity, elevation, and other environmental factors for the correct bullet drop compensation and pinpoint accuracy. All other dials and rings are also enhanced with knurling for a slip-free grip.